GENETIC DIVERGENCE IN BEAN (Phaseolus vulgaris L.) WITH GRAIN OF CARIOCA TYPE
Keywords:
plant breeding, choice of parents, multivariate techniques, cluster analyses.Abstract
Genetic dissimilarity measures are commonly used by plant breeders to identify dissimilar parents to get desired segregant populations. Multivariate techniques were utilized to evaluate the genetic dissimilarity among 53 genotypes of the carioca bean (Phaseolus vulgaris L.). Six traits were evaluated in a field experiment using a randomized block design with four replications. Canonical variable analysis and cluster analysis using Tocher's agglomerative method and hierarchical method (nearest neighbor) were applied. Generalized Mahalanobis distance (D2) was used to measure dissimilarity. Genotypes comprised twenty six distinct groups by Tocher's method. Thousand seed weight was the most important trait to the total genetic dissimilarity. The obtained results allowed to characterize dissimilar genotypes to be strategically used in artificial hybridizations.
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